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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cae61fc8da5153a668ab26604ede89d64a08fff926eae22d6ffe38dbbf611a' 
  AND token = 'zd/7NUFaFvlM7KQufABcorS3US4Tm92K27MeHVfdX4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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