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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf67696e262196daef1d0e24bb3c4b4b21faa3d38464e374af61cf92a6d1c11d' 
  AND token = 'cz7Khat9Dq1E+1AkbARO0Bk9oXj8THdOuSHietlZvrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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