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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286fa6fb36c7897d76add8e0a4e4cc5c413f8bcf70449eb9b52a10a0eeacdebf' 
  AND token = 'T3/7jo7B0uKmpEKk61Nw1s5ux85zzMdXZBTXysR58kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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