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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e06efd7dc4f21fc87009e81904b54dc248d65f80d597cef7f7e2dec89f042ad' 
  AND token = 'Rzz/wMs3evzE+pA1K45O5M5z+ApQdmaXEBp6nDAN1uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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