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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571173339a65d8b42f2c2e017b8bdfae7bee3dbc4eaf716dec54287979e2095a' 
  AND token = 'a6IGvR3OIPvdwJ99UQHUBwuTZdn6pz5t0hiso5VW1CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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