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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecec96b4dd4949f3fe42b9c842e95f781eeb5acb28f98a12039cfae36e4c8f8b' 
  AND token = '3lLazZjcNdYDv9IDDVUBAntyG/GrBQnixjrbABz2iVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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