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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e0821a83714491abe768cef43f345544164ff1e41ce3eb254c91fd6cdf705c' 
  AND token = 'VNEiJevAKFdDgWNsnW/eJXLeuj8KD4Q5dXN7qxBI6b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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