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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d923808547903e93a28816f83192160ad4af7d0814fc7eff16d7779461eb91' 
  AND token = '3EYxGgszRZgG8A+/AobKeCRA62ixV+0Mwgecv/lu2OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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