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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297b83b55b06df2d8a7752d268f906fbf5439687319cbd3c76dbc2f788aeea7e' 
  AND token = 'eZetSjlRh/hCG22W1ECJBi6A+58AhEC9aoe3UyGOk9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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