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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7bf8c079477c71189dd2ceb3c242d081b9b4ed9e299fc9ceee84c3a7053ac03' 
  AND token = 'FqYL3qW7MuEVajT23rBzxT4Ks26MV1MqA4qXAA3H0zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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