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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d9ad7e568923a2073836cdb0bb71d1f1c280e037ebd045b9180dbd45ccc24c' 
  AND token = 'eoocH7PwlLXPryGSJ0gOeJI85QMHoAuAlXvC2ceFFl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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