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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4009910839ed78ae6215d14a814d6402c119d1d3415c805bbdbe6adef1c1e377' 
  AND token = 'LCDkGVwmdu27uDwD+BcUksii0RzF9wl9dihxHkbIRaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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