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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836598bd092e21db513fab0e6b304f3e7200e61513137a8787f35a5d7c42ab37' 
  AND token = 'zdyGJkBevDRj82EnZNZSgrmryj3MWslmGlgm665lhBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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