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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca015aaaa8606d848ebc20ae54b5a0c1f692d01f594ac8cbfa9b2730cd158e86' 
  AND token = '2fTWwVXkqioOmPEDTeFS6VYcsOJ5392hGN7oMD/9RnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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