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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9828a82ba493d80312d3cee2e14ea2021f24f62f77f401a25b2432e6dbf1e553' 
  AND token = 'VLVTqI7cF8kE1LkTCHPUkX/kElcqlmRy5PDP4yEAl1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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