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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcdfb9ab90eb452d78c6e4cf2c1b33a39d496faae0dc7b48a427010f2ec7463' 
  AND token = 'ms/uaouSD0gtgD8Ron08q6n5jwp0pJ7YD2xOAXvtURw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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