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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd0376a45f83afb339993bc48387deb6ac36ff847b4e91027f145aeb42eceab' 
  AND token = 'Q8bIs3y0UCT4Cvz+G42UHNsQ5gvBQRW50lc7tNlVvvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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