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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd113a9ab3a64290c7617d935424bfa2f75032f001425050ccff476a16ec022de' 
  AND token = 'EYCeBsK6DT0hcDsYDDlboUEOI8L7fOjNo5gJLh64u44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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