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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd417ce8f6e98b6be419db20b9c32710ef3a74fb590e8ae168a0cc2b0d863862a' 
  AND token = 'sRq72TwBgETR62rz/EADFy3PgCg1uR3cCSzY18KauqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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