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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7a052e34ac17d6eeadd4ac53719ac2d1df27952406251d2413ead73be9d17d' 
  AND token = 'scTH3lewtPBZfXPWowWkXZNAbAF2ulWo09/h1gylGsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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