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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097e696875ece348eb5ca6b08f56e271e225e9b5bbe4b7dfb03edd6dee73c857' 
  AND token = 'xHzVfAS75tRcDDd8koZO0TtHbDjvzo8jhuS5+Daico8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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