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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e37c36889e5010db1bf362d5e806ef8b21e638890ad550fca837c03874cae30' 
  AND token = 'c7HKlAL8V1Jt90V5y1fj5CBBKVHd1YmeMOEXt5/92Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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