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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7adc1430f00e5c37de7ce57b85a1a3063b4f42b4026b223480874956e375e3d' 
  AND token = '7G7rNqrs4fQ3qCWjE2UP2Wk5NAubXjnyLty2gNObSiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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