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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46daf2b7e6dc85bebd9dce3e79bc4137f4823e2514f06bab2876969eff6fec64' 
  AND token = 'dI+nW8sT60wKyhocYnE1E9Se07gFlE/4ebPB3VvLyp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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