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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cda1cdef2384c03d6e9a2c200304655cbc04c5bf4e0ca268c73710f5d65cfc1' 
  AND token = 'jyOpPvLcNJjYMvMZWb63OA0A4l1iq6hTSc8dKcvRROE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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