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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda8fc663761d85a58e45aa652f05facff810ae6d765bc39cc3a4eea6675c128' 
  AND token = 'lISXU8lQyE0wEvKpThgPvJL4zHKuh8CDKdugDEu/WvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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