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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1a766c61d3cbe4a0143e1593344dfa7fa31e08a09b871adfe49a504692324d' 
  AND token = 'kNTO638wbWyS/o3Y0sXQpe+s20DT5cUe6yQVgWW829w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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