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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec26f34c92625272eb929fef45d75b3c0798d8f8693c85ba7d445e4704882a0' 
  AND token = 'qHonBu1htHajViNRnm0FEmLFMCXT4hmgGxGnWGCL0kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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