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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9074e59ba1b1728b6dd0e043a79baeabbe9500b6269475614747c79b25184d4b' 
  AND token = 'HhKUq8wK+WD53WqHtX0W49Kl6PCBG6c6TVyzKewJb7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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