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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f9a616358242a5c98a5e3f00b383884b2ebf6f0b328c6342d0ba2c2cf4b38f' 
  AND token = '5Wl6sj4aMYXha/5o4es1eunnryTLLsTjAsEDGUDnoX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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