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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd74fe6e8bffd40b4754f3336a33bcb1f98715b162b30ed9f2ffe69c4169cf3ec' 
  AND token = 'udgYEM+APZoSLr4fiQSMum4rAlbYDhEfDmI2Kwj9+2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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