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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ab72a888555ad6e813dd2aaff1141ae89de4c3a5a5d7ec4a4e77143651e317' 
  AND token = 'Hmr4v172b3M7hfVcJco7z/UAoxEr4fX2gsI5iUu++PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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