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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e792b9b0e7b1b9bad31cbb2f29b5f6989f7d0fd70df21f5d12f7128df5f55722' 
  AND token = 'awW1U5GSa/vMQDUEUj7ESobSMfCkgwINIFK8BJyg7NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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