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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f82b3cd151b48787648d0e9fb8316032bc99db74b0bba77fbf72f0d11a8c3d' 
  AND token = '+B6sGGSDoMj7P7TdQQSSo4DDam9B9+kVNvWqXgbjb4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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