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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c429bc2019c6f78a46a19ef8081186c6ca449b311c29eeefb69725df66860cf' 
  AND token = 'uCSGpY+cNw5lMncP0NeQFVO2iB/C8FDyJRdAyPu1QAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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