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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3627ef9a82fc11bb94d547affa9e9f967c852cdde8e1c9dca43bf60e806c401' 
  AND token = '2pH2VR/5hzFNEnfR9TJ6gt/6PdsNHKSEujXFWomNOGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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