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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2addd721eeed5d7cf4c06626edef1d47c18f84d7e2ae98024c7519588a3403' 
  AND token = '+1Po/5O8/ydE7XBDnpupN+V0eFbAYK0SBKsTwAL3pSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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