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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2f851c699aab29c2c0d56895c6feb21b23866283b7f9e122d3f32e182a1fec' 
  AND token = 'hovbVZ9Ck1TnqXFjSEaWofJMUtJTf8sCWS68l68itXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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