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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb65e3211d506f881177b991a5e20738ad466db01a88302b557fe6e0374e0c4' 
  AND token = 'jQjIjzz0J8BdLT6pUE0sUgSi5LZxNV/eu7mud62k1ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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