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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179909b9d4ba6d1dbfcde22610662e032aa5bd7c0e284f40e2f7fe3812a4095e' 
  AND token = '5Z/Cvdi6R7uQbpVAKOKsNs7vxA0fMdnaGgSNs2ZWlwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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