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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee65a83a70b0e1461633329337361994204160c0be2520d2371cb48c6f6f4b9' 
  AND token = '9MSbn91U57I6uMVr97oU8Iwn3qwYl2WR0yVM7WoTU6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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