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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af49863148c266fcc732e7dfc1122d6df3174eae53ab9d1328855e9a1731c10f' 
  AND token = '9iT0sYDlW+vBgiIvYtem5yEFdbTXS5h7nU3p52/gg+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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