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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953fe1d3d1877e12350f1acce79c8d566e5feb45481b60ffa418f2999a6bb30e' 
  AND token = 'r2utuVTdZLMKWF2IJmHuHIeQFha0IDZ1wiSi+NlxxUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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