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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c7682fb2f70fcfef888aacbedc9d2c800f0d63d09fafa1695d24eaf5ae116b' 
  AND token = 'IcCc2TI8gNvuNp0qx7oVq147jsuHP43/x2SyAX2LxPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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