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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd79f0f49e8f91bbb70e1577a461fcd667dcf2d7978d6a56c9637b4617e7165' 
  AND token = 'lbCoQRgkmD/xmfj3/zSHnM5fksSgVWbIVjMdWcY3pZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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