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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b217630fa9ed4ffea43a6bc28636f779877b05d23dfde73f53a4cee98b327628' 
  AND token = '6CcI5lNuRNdchEOX58Nunm+8s+6uyFycU6OZ1sIBL4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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