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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55bc457e9227d6c107e7c1f33829f100584041f34ff3cf1e2e14001b247a904' 
  AND token = '6aJGhOyoLUS3bOBSZEMXIoqjYLJnxtW80W6yBpYbUiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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