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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a121c63f92e3e37500c965dc2e79cd2b5fe7a64ff9c42036ab94aa2452b809' 
  AND token = 'eqEgh/02+LHUt09XKVC2HUHFu16fd/iUUw6M/lxvcu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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