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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ed80eba2638e9b2e99320c18146d61964acf594de4fcede0b34708f721efef' 
  AND token = '3VYo/gcZlgSTcGVdGSV7ZxPP6X1Yosmg1aAw3aTHweg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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