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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0a1bb4fd525b9a59198c233260acfa88acf342773549c174bf754b043fc08c' 
  AND token = '/dzixb97c/4dI4VQfusHzHrSj70S1YFLE/eU27Sgb/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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