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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b062229728e11f7ac72e34b676e727a9b34bb8f7d4b9b3ad087b4f3c7e7cdb3' 
  AND token = 'ccR4sU0Nv8eF2LVBgwc0eVmWxQ+BYEq0csgbw0D7ZkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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