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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0cd3153b9a08143fdd81652ae9ad21ea65858bca23c7af8992b0e2f50cfe7bd' 
  AND token = 'pqc7bwDfeJAsDRrMTo0N9Z8586n/25cRcSEiG+IuV4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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