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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f32691a9476dc4212d0cfd0b98dc96082fcc6ba4b4cc7e93f6df2b7e9dd779' 
  AND token = 'SEAgmU2TE5TrAJrnQUNnCVi2LUaYLzhf22peaWMA8oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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