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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48470e32e44db9c214fe3df445212475bd5dc8492ba17e39564cdef5e0836b8f' 
  AND token = 'JibpxUhHlVCbj1nY56JmBjfk4YS0xUfTL+o7yoxsfOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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