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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95dd28e663fac10d0984c87c8672f1b37c2ce49599037cbfa67e41f74f33f76' 
  AND token = '+8HUobYOs7amzQ3hIVxXdw+rck+EeQ68cS4Xof6spuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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