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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da08ca30e8479fe5ac8cd27c0e21ec9792df0a667c61bd88bcb18abc737ba1d' 
  AND token = 'lan59Mvlr3nhBfl4UrZEcK0BRE/rsgybXBGfdtvMCus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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