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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee34ae027d0c6fbbd347b411cf398b0267a3923a367dc11a17bebd7dcb1c0d4' 
  AND token = 'UQC/vWV5Nd5uc67JuEBkBfv4Qbq1f2Lmo7r0AQx6re0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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