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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0fd7578594f4b84d35d550f592b9893baf0c0c1042e8a2e7924b95245f2323' 
  AND token = '8ll2n4AA67g+mf0M+1LZOppPeYX46Ua08VK7zH/3bfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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