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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61aa2e28f65a3a344b61409af9634f0bc29dd3d4cdb299cdebab37ce1d3bd74' 
  AND token = 'IxfWB5dhy3dyTudNxGbB8WlT/2Q5vAR6cvjejgkAkSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}