SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d70fc0e3f02c3a9f8e4782743244927176bc1c3f560ec3308956a75a9edfe29' 
  AND token = '+hRBkcH2n1PAzmjyusRmPs6NyxwSK5P3EW1Vqt9/4ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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